421020413 has 4 divisors (see below), whose sum is σ = 459295008. Its totient is φ = 382745820.

The previous prime is 421020409. The next prime is 421020427. The reversal of 421020413 is 314020124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 421020413 - 2² = 421020409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421020391 and 421020400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421020713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19137281 + ... + 19137302.

It is an arithmetic number, because the mean of its divisors is an integer number (114823752).

Almost surely, 2^421020413 is an apocalyptic number.

It is an amenable number.

421020413 is a deficient number, since it is larger than the sum of its proper divisors (38274595).

421020413 is a wasteful number, since it uses less digits than its factorization.

421020413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38274594.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 421020413 is about 20518.7819570266. The cubic root of 421020413 is about 749.4932357378.

Adding to 421020413 its reverse (314020124), we get a palindrome (735040537).

The spelling of 421020413 in words is "four hundred twenty-one million, twenty thousand, four hundred thirteen".